Wild gorillas using 'weaponry'

In 2005, researchers reported the first documented use of tools among lowland gorillas in the wild, with photographs showing two female gorillas using sticks and stumps to test the depth of the water as they crossed a swamp in the Republic of the Congo. But there is no previous documentation of western gorillas using tools in an aggressive way, according to Sunderland Groves, who is now a visiting researcher with the Center for International Forestry Research based in Bogor, Indonesia.

Same article appear in San Diego Union Tribune